using System;

using System.Collections.Generic;

using System.Dynamic;

namespace Python.Test;

/// <summary>

/// Base class for dynamic test helpers. Uses lazy storage initialization so that

/// Python-derived subclasses can safely call DynamicObject member hooks before

/// managed field initializers have run.

/// </summary>

public class DynamicStorageObject : DynamicObject

{

Dictionary<string, object> storage;

// Python-defined subclasses may reach this type without running managed field

// initializers (see ClassDerivedObject.NewObjectToPython). Via the lazy init

// we can ensure that the access is still safe, even when the constructor has

// not run.

protected Dictionary<string, object> Storage => storage ??= [];

public void AddDynamicMember(string name, object value) => Storage[name] = value;

public override bool TryGetMember(GetMemberBinder binder, out object result)

=> Storage.TryGetValue(binder.Name, out result);

public override bool TrySetMember(SetMemberBinder binder, object value)

{

Storage[binder.Name] = value;

return true;

}

public override bool TryDeleteMember(DeleteMemberBinder binder)

=> Storage.Remove(binder.Name);

public override IEnumerable<string> GetDynamicMemberNames() => Storage.Keys;

}

public class DynamicMappingObject : DynamicStorageObject

{

// Native members for testing that regular CLR access is unaffected.

public string Label = "default";

public int Multiplier { get; set; } = 1;

public int Multiply(int value) => value * Multiplier;

// Test helper: bypass normal member binding and write directly to dynamic storage.

public void SetDynamicValue(string name, object value) => Storage[name] = value;

// Test helper: retrieve the actual value stored in C# (for verification that None was stored as null)

public object GetDynamicValue(string name) => Storage.TryGetValue(name, out var value) ? value : null;

}

public class RejectingSetDynamicObject : DynamicStorageObject

{

public override bool TrySetMember(SetMemberBinder binder, object value)

{

if (!Storage.ContainsKey(binder.Name))

return false;

Storage[binder.Name] = value;

return true;

}

}

public class ThrowingGetDynamicObject : DynamicStorageObject

{

public override bool TryGetMember(GetMemberBinder binder, out object result)

=> throw new InvalidOperationException($"TryGetMember failed for '{binder.Name}'");

}

public class ThrowingSetDynamicObject : DynamicStorageObject

{

public override bool TrySetMember(SetMemberBinder binder, object value)

=> throw new InvalidOperationException($"TrySetMember failed for '{binder.Name}'");

}

public class RejectingDeleteDynamicObject : DynamicStorageObject

{

public override bool TryDeleteMember(DeleteMemberBinder binder)

{

if (!Storage.ContainsKey(binder.Name))

return false;

return Storage.Remove(binder.Name);

}

}

public class ThrowingDeleteDynamicObject : DynamicStorageObject

{

public override bool TryDeleteMember(DeleteMemberBinder binder)

=> throw new InvalidOperationException($"TryDeleteMember failed for '{binder.Name}'");

}